S = input()
if "RRR" in S :
    print("3")
elif "RR" in S :
    print("2")
elif "R" in S :
    print("1")
else :
    print("0") S = input() S input() input if "RRR" in S :
    print("3")
elif "RR" in S :
    print("2")
elif "R" in S :
    print("1")
else :
    print("0") "RRR" in S "RRR" S print("3") print "3" elif "RR" in S :
    print("2") "RR" in S "RR" S print("2") print "2" elif "R" in S :
    print("1") "R" in S "R" S print("1") print "1" print("0") print "0" S = input() input() S
S = input()
if "RRR" in S :
    print("3")
elif "RR" in S :
    print("2")
elif "R" in S :
    print("1")
else :
    print("0")